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Angew Chem Int Ed Engl

Title:		All-Inorganic CsPb(1-x) Ge(x) I(2) Br Perovskite with Enhanced Phase Stability and Photovoltaic Performance
Author(s):		Yang F; Hirotani D; Kapil G; Kamarudin MA; Ng CH; Zhang Y; Shen Q; Hayase S;
Address:		"Graduate School of Life Science and Systems Engineering Institution, Kyushu Institute of Technology, 2-4 Hibikino Wakamatsu-ku, Kitakyushu, 808-0196, Japan. Department Graduate School of Informatics and Engineering, University of Electro-Communications, 1-5-1 Chofugaoka, Chofu, Tokyo, 182-8585, Japan"
Journal Title:		Angew Chem Int Ed Engl
Year:		2018
Volume:		20180829
Issue:		39
Page Number:		12745 - 12749
DOI:		10.1002/anie.201807270
ISSN/ISBN:		1521-3773 (Electronic) 1433-7851 (Linking)
Abstract:		"Compared with organic-inorganic perovskites, all-inorganic cesium-based perovskites without volatile organic compounds have gained extensive interests because of the high thermal stability. However, they have a problem on phase transition from cubic phase (active for photo-electric conversion) to orthorhombic phase (inactive for photo-electric conversion) at room temperature, which has hindered further progress. Herein, novel inorganic CsPb(1-x) Ge(x) I(2) Br perovskites were prepared in humid ambient atmosphere without a glovebox. The phase stability of the all-inorganic perovskite was effectively enhanced after germanium addition. In addition, the highest power conversion efficiency of 10.8 % with high open-circuit voltage (V(OC) ) of 1.27 V in a planar solar cell based on CsPb(0.8) Ge(0.2) I(2) Br perovskite was achieved. Furthermore, the highest V(OC) up to 1.34 V was obtained by CsPb(0.7) Ge(0.3) I(2) Br perovskite, which is a remarkable record in the field of all-inorganic perovskite solar cells. More importantly, all the photovoltaic parameters of CsPb(0.8) Ge(0.2) I(2) Br perovskite solar cells showed nearly no decay after 7 h measurement in 50-60 % relative humidity without encapsulation"
Keywords:		germanium iodide inorganic perovskites lead substitutes phase stability solar cells;
Notes:		"PubMed-not-MEDLINEYang, Fu Hirotani, Daisuke Kapil, Gaurav Kamarudin, Muhammad Akmal Ng, Chi Huey Zhang, Yaohong Shen, Qing Hayase, Shuzi eng JST Mirai Program/ Germany 2018/08/03 Angew Chem Int Ed Engl. 2018 Sep 24; 57(39):12745-12749. doi: 10.1002/anie.201807270. Epub 2018 Aug 29"